MultiThread - Synchronized trong Java - Đồng bộ 3 threads - Sinh số ngẫu nhiên, bình phương, và chia hết

#Main.java

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package com.gokisoft.bt1102;

/**
 *
 * @author teacher
 */
public class Main {
    public static void main(String[] args) {
        SharedData sharedData = new SharedData();
        
        Thread1 t1 = new Thread1(sharedData);
        Thread2 t2 = new Thread2(sharedData);
        Thread3 t3 = new Thread3(sharedData);
        
        t1.start();
        t2.start();
        t3.start();
    }
}

#SharedData.java

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package com.gokisoft.bt1102;

/**
 *
 * @author teacher
 */
public class SharedData {
    public static final int THREAD_1 = 1;
    public static final int THREAD_2 = 2;
    public static final int THREAD_3 = 3;
    
    int rad;
    int total;
    
    int currentThread = THREAD_1;

    public SharedData() {
        total = 0;
    }

    public int getRad() {
        return rad;
    }

    public void setRad(int rad) {
        total += rad;
        this.rad = rad;
    }
    
    public boolean isLive() {
        return total < 2000;
    }

    public int getCurrentThread() {
        return currentThread;
    }

    public void setCurrentThread(int currentThread) {
        this.currentThread = currentThread;
    }
    
    
}

#Thread1.java

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package com.gokisoft.bt1102;

import java.util.Random;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author teacher
 */
public class Thread1 extends Thread{
    SharedData sharedData;

    public Thread1(SharedData sharedData) {
        this.sharedData = sharedData;
    }

    @Override
    public void run() {
        Random random = new Random();
        
        synchronized(sharedData) {
            while (sharedData.isLive()) {            
                int rad = random.nextInt(100);
                System.out.println("T1 > " + rad);
                sharedData.setRad(rad);

                if(rad % 3 == 0) {
                    //Thread 2 se chay
                    sharedData.setCurrentThread(SharedData.THREAD_2);
                } else {
                    //Thread 3 se chay
                    sharedData.setCurrentThread(SharedData.THREAD_3);
                }
                
                sharedData.notifyAll();
                try {
                    while (sharedData.isLive() && sharedData.getCurrentThread() != SharedData.THREAD_1) {                        
                        sharedData.wait();
                    }
                    if(!sharedData.isLive()) break;
                } catch (InterruptedException ex) {
                    Logger.getLogger(Thread1.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
        System.out.println("T1 stop");
        synchronized(sharedData) {
            sharedData.notifyAll();
        }
    }
    
    
}

#Thread2.java

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package com.gokisoft.bt1102;

import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author teacher
 */
public class Thread2 extends Thread{
    SharedData sharedData;

    public Thread2(SharedData sharedData) {
        this.sharedData = sharedData;
    }

    @Override
    public void run() {
        synchronized(sharedData) {
            while (sharedData.isLive()) { 
                sharedData.notifyAll();
                try {
                    while (sharedData.isLive() && sharedData.getCurrentThread() != SharedData.THREAD_2) {                        
                        sharedData.wait();
                    }
                    if(!sharedData.isLive()) break;
                } catch (InterruptedException ex) {
                    Logger.getLogger(Thread2.class.getName()).log(Level.SEVERE, null, ex);
                }
                
                int rad = sharedData.getRad();
                System.out.println("T2 > " + (rad * rad));

                //Thread 1 -> se tiep tuc chay
                sharedData.setCurrentThread(SharedData.THREAD_1);
            }
        }
        System.out.println("T2 stop");
        synchronized(sharedData) {
            sharedData.notifyAll();
        }
    }
    
    
}

#Thread3.java

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package com.gokisoft.bt1102;

import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author teacher
 */
public class Thread3 extends Thread{
    SharedData sharedData;

    public Thread3(SharedData sharedData) {
        this.sharedData = sharedData;
    }

    @Override
    public void run() {
        synchronized(sharedData) {
            while (sharedData.isLive()) { 
                sharedData.notifyAll();
                try {
                    while (sharedData.isLive() && sharedData.getCurrentThread() != SharedData.THREAD_3) {                        
                        sharedData.wait();
                    }
                    if(!sharedData.isLive()) break;
                } catch (InterruptedException ex) {
                    Logger.getLogger(Thread3.class.getName()).log(Level.SEVERE, null, ex);
                }
                           
                if(sharedData.getRad() % 4 == 0) {
                    System.out.println("T3 > " + sharedData.getRad() + " % 4 = 0");
                } else {
                    System.out.println("T3 > " + sharedData.getRad() + " % 4 != 0");
                }

                //Thread 1 -> se tiep tuc chay
                sharedData.setCurrentThread(SharedData.THREAD_1);
            }
        }
        
        System.out.println("T3 stop");
        synchronized(sharedData) {
            sharedData.notifyAll();
        }
    }
    
    
}

VIET CHUONG TRINH TONG QUAT

#Main.java

/*
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 * and open the template in the editor.
 */
package com.gokisoft.bt1102;

/**
 *
 * @author teacher
 */
public class Main {
    public static void main(String[] args) {
        SharedData sharedData = new SharedData();
        
        Thread1 t1 = new Thread1(sharedData);
        Thread2 t2 = new Thread2(sharedData);
        Thread3 t3 = new Thread3(sharedData);
        
        t1.start();
        t2.start();
        t3.start();
    }
}

#SharedData.java

/*
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 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package com.gokisoft.bt1102;

/**
 *
 * @author teacher
 */
public class SharedData {
    int rad;
    int total;
    
    public SharedData() {
        total = 0;
    }

    public int getRad() {
        return rad;
    }

    public void setRad(int rad) {
        total += rad;
        this.rad = rad;
    }
    
    public boolean isLive() {
        return total < 2000;
    }
}

#SyncThread.java

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package com.gokisoft.bt1102;

import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author teacher
 */
public abstract class SyncThread extends Thread{
    public static final int THREAD_1 = 1;
    public static final int THREAD_2 = 2;
    public static final int THREAD_3 = 3;
    
    private static int currentThread = THREAD_1;
    
    private final int _threadIndex;
    private final boolean _isRunningFirst;
    private final Object _sharedData;

    public SyncThread(Object sharedData, int threadIndex, boolean isRunningFirst) {
        this._threadIndex = threadIndex;
        this._sharedData = sharedData;
        this._isRunningFirst = isRunningFirst;
    }

    @Override
    public void run() {
        synchronized(_sharedData) {
            while (isLive()) {
                if(!_isRunningFirst) {
                    _sharedData.notifyAll();
                    try {
                        while (isLive() && _threadIndex != currentThread) { 
                            _sharedData.wait();
                        }
                        if(!isLive()) break;
                    } catch (InterruptedException ex) {
                        Logger.getLogger(SyncThread.class.getName()).log(Level.SEVERE, null, ex);
                    }
                }
                           
                //Logic rieng cua tung Thread
                onRunning();
                
                if(_isRunningFirst) {
                    _sharedData.notifyAll();
                    try {
                        while (isLive() && _threadIndex != currentThread) { 
                            _sharedData.wait();
                        }
                        if(!isLive()) break;
                    } catch (InterruptedException ex) {
                        Logger.getLogger(SyncThread.class.getName()).log(Level.SEVERE, null, ex);
                    }
                }
            }
        }
        
        System.out.println("##T" + _threadIndex + " stop");
        synchronized(_sharedData) {
            _sharedData.notifyAll();
        }
    }
    
    public void setCurrentThread(int threadIndex) {
        currentThread = threadIndex;
    }
    
    public abstract boolean isLive();
    public abstract void onRunning();
}

#Thread1.java

/*
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package com.gokisoft.bt1102;

import java.util.Random;

/**
 *
 * @author teacher
 */
public class Thread1 extends SyncThread{
    SharedData sharedData;
    Random random;

    public Thread1(SharedData sharedData) {
        super(sharedData, THREAD_1, true);
        this.sharedData = sharedData;
        random = new Random();
    }

    @Override
    public boolean isLive() {
        return sharedData.isLive();
    }

    @Override
    public void onRunning() {
        int rad = random.nextInt(100);
        System.out.println("T1 > " + rad);
        sharedData.setRad(rad);

        if(rad % 3 == 0) {
            //Thread 2 se chay
            setCurrentThread(THREAD_2);
        } else {
            //Thread 3 se chay
            setCurrentThread(THREAD_3);
        }
    }
}

#Thread2.java

/*
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package com.gokisoft.bt1102;

/**
 *
 * @author teacher
 */
public class Thread2 extends SyncThread{
    SharedData sharedData;

    public Thread2(SharedData sharedData) {
        super(sharedData, THREAD_2, false);
        this.sharedData = sharedData;
    }

    @Override
    public boolean isLive() {
        return sharedData.isLive();
    }

    @Override
    public void onRunning() {
        int rad = sharedData.getRad();
        System.out.println("T2 > " + (rad * rad));

        //Thread 1 -> se tiep tuc chay
        setCurrentThread(THREAD_1);
    }
    
}

#Thread3.java

/*
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package com.gokisoft.bt1102;

/**
 *
 * @author teacher
 */
public class Thread3 extends SyncThread{
    SharedData sharedData;

    public Thread3(SharedData sharedData) {
        super(sharedData, THREAD_3, false);
        this.sharedData = sharedData;
    }

    @Override
    public boolean isLive() {
        return sharedData.isLive();
    }

    @Override
    public void onRunning() {
        if(sharedData.getRad() % 4 == 0) {
            System.out.println("T3 > " + sharedData.getRad() + " % 4 = 0");
        } else {
            System.out.println("T3 > " + sharedData.getRad() + " % 4 != 0");
        }

        //Thread 1 -> se tiep tuc chay
        setCurrentThread(THREAD_1);
    }
    
}